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Of his 46,875 shares of Nonvoting Common Stock, (i) 15,375 are held in his individual name and (ii) 31,500 are held jointly with his spouse with right of survivorship"},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Includes 46,875 shares of Nonvoting Common Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date. Of his 46,875 shares of Nonvoting Common Stock, (i) 15,375 are held in his individual name and (ii) 31,500 are held jointly with his spouse with right of survivorship"}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":46875},"source":{"system":"sec-edgar","filing":"0001628280-25-040786","document":"wk-form4_1755633964.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2080678/000162828025040786/wk-form4_1755633964.xml","form_type":"4"}},{"id":1062516,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":25945,"kind":"person","name":"Eckert Kurt M.","position":1,"cik":"0002080678","reported_name":"Eckert Kurt M.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-08-19T20:06:15.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":true,"shares":46875,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Includes 46,875 shares of Nonvoting Common Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date. Of his 46,875 shares of Nonvoting Common Stock, (i) 15,375 are held in his individual name and (ii) 31,500 are held jointly with his spouse with right of survivorship"},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Includes 46,875 shares of Nonvoting Common Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date. Of his 46,875 shares of Nonvoting Common Stock, (i) 15,375 are held in his individual name and (ii) 31,500 are held jointly with his spouse with right of survivorship"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 46,875 shares of Nonvoting Common Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date. Of his 46,875 shares of Nonvoting Common Stock, (i) 15,375 are held in his individual name and (ii) 31,500 are held jointly with his spouse with right of survivorship"}],"balance_after":167375,"source":{"system":"sec-edgar","filing":"0001628280-25-040786","document":"wk-form4_1755633964.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2080678/000162828025040786/wk-form4_1755633964.xml","form_type":"4"}}]}